system. >> investigators are tomingthroughtamerlan's tripin the caucus region. investigators continue to probe hospit links to islamist groups including the caucuses em rit. >> those are fighting in syria iraq pakistan and afghanistan. in 2007 a guy threatened the united states of america directly. >> some believe despite yesterday's reading of his miranda rights the federal government still holds swooifr the younger tsarnaev. negotiate ago plea deal under which he would cooperate with authorities in exchange for sparing his life remains an option. >>> the wife of the dead boston bombing suspect found out her husband and brother in law were the accused bomber the same way all americans did on tv. her lawyer claims she suspected nothing this as they ask another question was tamerlan tsarnaev involved in a 2009 triple murder. molly, we also hear that there is good news today about the victim. >> good morning, heather. two in critical condition. doctors are telling us everyone now in the hospital are expect to do survive. there were 14 patients that lost lefshs. boston medical center say

is detonated. we are also learning about his olderbrother,tamerlantsarnaev.in 2009 he was arrested for domestic assault after his girlfriend said he beat her up no last year he openly argued with a preacher at a mosque, telling him holiday celebrations were not allowed by islam. last year he disrupted a sermon by martin luther king calling him a nonbeliever. today marks one week since the attack. from the oval office and around the country a solemn tribute. >> the boston area, most every spot in the city is silent. >> reporter: another step toward normal, boyleston street turned over by federal investigators to the city of boston in the sign of ip ves gags intensity, a tree possibly touched by dzhokhar. taken as evidence. and photos of him, possibly tracking the murder of officer carter. some seriously injured in the hospital, hope. >> nearly all of the patients that have lost legs are already walking the halls with physical therapists. >> reporter: still, grim reminders here just about everywhere. in medford the funeral for krystle campbell. one more step to normal. at 10:00 a.m.

: eric shawn live in boston. eric, thank you. we are still trying to get to the real storyontamerlantsarnaev'strip to russia last year and his possible ties to terrorism and islamic extremism. chief intelligence correspondent catherine herridge is following that thread tonight. >> the fbi's handling of tamerlan tsarnaev in 2011 and six-month trip to russia the following year now face congressional scrutiny. >> was your department aware of his travels to russia and, if you weren't, the reason? >> yes. the system pinged when he was leaving the united states. by the time he returned all investigations had been -- the matter had been closed. >> napolitano said the lookout system that flags agents federal investigation no longer active when tamerlan returned from russia in july of 2012. >> the system picked up departure but did not pick him coming back, correct? >> the fbi text alert on him at that point was more than a year old and had expired. >> napolitano's pluck contradict briefing given by the fbi director. >> after talking to the fbi they told me they had no knowledge of him leav

that it appears dzhokhar and his older brothertamerlanwasby i ideology. chilling new details in a ten-page fbi affidavit. a few minutes after the surveillance video captured the brothers at the marathon they split up according to court documents. tarrer lan heads to the finish line as his younger brother blends in with the crowd. dzhokhar places his backpack on the ground. at 2:50 the first bomb explodes. according to the affidavit, virtually every head turns, stares in that direction in apparent bewilderment and alarm, dzhokhar appears calm walk as way without his backpack seconds later, it detonates in the exact spot where he was landing. during thursday's getaway, one of the brothers bragged, did you hear about the boston explosion? i did that. and dzhokhar's roomdartmouth, key evidence. a black jacket andhat. matching the clothing he was wearing at the scene. law enforcement sources say there are clear signs that tamerlan, the older brother, had become increasingly radicalized, motivated by jihadi websites. they picked the boston marathon and boylston street bec

their device with the help of al qaeda,andtamerlantsarnaevcalled most of the shots, and lawmakers on capitol hill are demanding more answers. top fbi officials meeting in a closed door hearing. we don't know how much the feds will reveal at this statement of the investigation but that u.s. officials confirm that working theory, as he puts it, the two suspects acted fully alone. their radical islamic faith motivating them, and they toshed that online al qaeda magazine for bomb-making instructions as anybody on planet earth can if he or she wishes to do so. analysts call the guide for terrorist activity, with articles clerk make a bomb in the kitchen of your mom. u.s. reports the drone create you're in the same strike. the widow of tamerlan tsarnaev has stayed out of the public eye but today her attorney says he is cooperating. >> the reports of involvement by her husband and brother-in-law came as an absolute shock to them all. as a mother, a sister, a daughter, a wife, katy deeply mourns the pain and loss to innocent victims. >> shepard: we're learning more about her husband's tri

the road where the two boston marathonsuspects,tamerlananddzhokhar tsarnaev were engaging in this gunfight with police. we'll scroll through a couple of these pictures. keep your eyes here on the screen. the photos here show the brothers huddling behind a stolen suv at times as we reported through the hours last week, shooting at police, before this older brother tamerlan charges, runs towards these officers here, then he's seen lying in the street. the suv driven by his younger brother who we know is in fair condition at this hour at a hospital here in boston, he's in the car, accelerates toward his older brother, on the ground. >> what is the context for that? do they believe he was trying to escape, do they believe he was trying to maybe separate his brother from the officers or is there anything on this? >> i think his brother was on the ground, his brother was enga engaging, strapped with explosives and the younger brother from everything i've gleaned wants to get out of there. >> maybe because of the explosives. what does he wind up doing? >> ultimately gets out of t

andtamerlan, theolder brother, stood up and argued. then in january there was a praise for martin luther king jr. and he got up and called someone a hypocrite. he had to leave. >>gretchen: ostensibly this younger guy didn't know anything about the bombing until a week before. if that is true, that lends to what we were discussing this morning that he was just an underling. it brings out the story that the parents were absent. the parents had gone back to russia and this 19-year-old kid was able to be swayed by the older brother. it appears he was the one that radicalized himself. i'm not saying he's not to blame at all. >>brian: there's no way you should believe -- everyone's apparently running with this story. you've got to be kidding me. you question him for 90 seconds as he's come out of a harrowing situation like this. he's in self-preservation mode. this guy needs to be questioned for a couple of weeks, needs to see if his story line is up. then you've got to drill down on it with professional interrogators. he does not need to see his miranda rights read to him in bed. laughable. >>stev